The Claim: Always Wash Your Hands With Hot Water, Not Cold.

With swine flu sweeping across the country, health officials are reminding Americans to wash their hands often to reduce the spread of the disease.

Soap and warm water have long been said to prevent the spread of infections, but is warm or hot water really more effective than cold?

In its medical literature, the Food and Drug Administration states that hot water comfortable enough for washing hands is not hot enough to kill bacteria, but is more effective than cold water because it removes oils from the hand that can harbor bacteria.